Akademik Veri Yönetim Sistemi
Measurement, cilt.268, ss.1-14, 2026 (SCI-Expanded)
This study explores the acoustic
performance of a novel hybrid composite reinforced with natural fibers,
specifically Luffa cylindrica and Coconut fibers, in the context of automotive
noise insulation. The goal was to replace conventional diesel engine lids with
eco-friendly composite alternatives. Samples with varying fiber ratios were
produced using the hand lay-up method and tested via impedance tube to evaluate
their sound absorption coefficient (SAC) and sound transmission loss (STL).
Based on laboratory results, the optimal composition was determined to be 75%
Coconut and 25% Luffa fiber by volume, as tested using impedance tube
measurements (ASTM E2611,
ASTM E1050, ISO 10534–2). Subsequently, these findings were applied in
full-scale vehicle testing, including articulation index and decibel level
measurements, using the same composite configuration. The composite lid
incorporating the optimal ratio improved the interior noise environment in the
driver area by up to 7% in articulation index, as confirmed by tests at three
different speeds. All reported data are directly linked to the configurations
and test methods described in the manuscript. The material’s cost-effectiveness
is supported by using low-cost, renewable fibers and simple processes. Unlike
many previous studies that remain at component-level characterization, this
work demonstrates an in-vehicle application and acoustic validation of a natural
fiber hybrid composite and correlates standardized impedance tube results with
full-scale vehicle measurements.